New hardy varieties of rice show promise of producing high yields without the costly requirements of irrigation and application of commercial fertilizer by earlier high-yielding varieties.
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Arequirements of irrigation and application of commercial fertilizer by earlier high-yielding varieties
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Brequirements by earlier high-yielding varieties of application of commercial fertilizer and irrigation
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Crequirements for application of commercial fertilizer and irrigation of earlier high-yielding varieties
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Dapplication of commercial fertilizer and irrigation that was required by earlier high-yielding varieties
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Eirrigation and application of commercial fertilizer that were required by earlier high-yielding varieties
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正确答案: E